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FizzKit

WebSocket Tester

Point to any ws:// or wss:// endpoint and open a live connection in your browser. Send text, JSON, Base64, or hex payloads; see every incoming frame with timestamps, direction, and size; save recent endpoints and subprotocols locally.

Runs locally in your browser
Message log (0)
No messages yet. Connect and send.
Status
disconnected
Duration
—
Messages
0
Sent ↑
0 B
Received ↓
0 B
Protocol
(none)

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About WebSocket Tester

Point to any ws:// or wss:// endpoint and open a live connection in your browser. Send text, JSON, Base64, or hex payloads; see every incoming frame with timestamps, direction, and size; save recent endpoints and subprotocols locally.

WebSocket Tester is part of FizzKit — a collection of focused, browser-based tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.

Frequently asked questions

No — the browser WebSocket API disallows custom headers (including Authorization). Use the subprotocol field, query string, or first message for auth.